linux-kernel - [RFC PATCH 1/6] KVM: guest_memfd: Add config to show the capability to handle error page

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Message-Id: <56cd2f6f42351f2f27a07e5764bab7f689cc0059.1694599703.git.isaku.yamahata@intel.com>
Date:   Wed, 13 Sep 2023 03:48:50 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Michael Roth <michael.roth@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, erdemaktas@...gle.com,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        linux-coco@...ts.linux.dev,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yuan Yao <yuan.yao@...ux.intel.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Xu Yilun <yilun.xu@...el.com>,
        Quentin Perret <qperret@...gle.com>, wei.w.wang@...el.com,
        Fuad Tabba <tabba@...gle.com>
Subject: [RFC PATCH 1/6] KVM: guest_memfd: Add config to show the capability to handle error page

From: Isaku Yamahata <isaku.yamahata@...el.com>

Add config, HAVE_GENERIC_PRIVATE_MEM_HANDLE_ERROR, to indicate kvm arch
can handle gmem error page.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 virt/kvm/Kconfig     | 3 +++
 virt/kvm/guest_mem.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 1a48cb530092..624df45baff0 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -112,3 +112,6 @@ config KVM_GENERIC_PRIVATE_MEM
        select KVM_GENERIC_MEMORY_ATTRIBUTES
        select KVM_PRIVATE_MEM
        bool
+
+config HAVE_GENERIC_PRIVATE_MEM_HANDLE_ERROR
+	bool
diff --git a/virt/kvm/guest_mem.c b/virt/kvm/guest_mem.c
index 85903c32163f..35d8f03e7937 100644
--- a/virt/kvm/guest_mem.c
+++ b/virt/kvm/guest_mem.c
@@ -307,6 +307,9 @@ static int kvm_gmem_error_page(struct address_space *mapping, struct page *page)
 	pgoff_t start, end;
 	gfn_t gfn;
 
+	if (!IS_ENABLED(CONFIG_HAVE_GENERIC_PRIVATE_MEM_HANDLE_ERROR))
+		return MF_IGNORED;
+
 	filemap_invalidate_lock_shared(mapping);
 
 	start = page->index;
-- 
2.25.1